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Lookup NU author(s): Dr Tom Clifford,
Dr Daniel West,
Professor Emma Stevenson
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Routledge, 2017.
For re-use rights please refer to the publisher's terms and conditions.
© 2016 Informa UK Limited, trading as Taylor & Francis Group. This study examined the effects of beetroot juice on the repeated bout effect (RBE) to eccentric exercise. Twenty-nine recreationally active males performed two bouts of 100-drop jumps, separated by 14–21 days. Using a double-blind, independent groups design, participants consumed either a higher dose beetroot juice (H-BT; 250 ml, n = 10), a lower dose beetroot juice (L-BT; 125 ml, n = 9) or an isocaloric placebo (PLA; 250 ml, n = 10) for 3 days after bout 1; no drinks were consumed after bout 2. Maximal isometric voluntary contraction (MIVC), countermovement jump (CMJ), pressure-pain threshold (PPT) and creatine kinase (CK) were measured pre, post, 24, 48 and 72 h following both bouts. In bout 2, CMJ and MIVC recovered quicker and CK activity was attenuated (versus bout 1) (P < 0.05) in all groups, demonstrating an RBE. At 24 h post bout 1, MIVC was 84.1 ± 16.1, 83.6 ± 11.6, 79.7 ± 15.1% relative to baseline values in the H-BT, L-BT and PLA groups, respectively; at 24 h post bout 2, MIVC recovered to 90.7 ± 13.7, 92.9 ± 6.9, 87.8 ± 6.9, in the H-BT, L-BT and PLA groups, respectively. These findings suggest that supplementation with antioxidant-rich beetroot juice does not adversely affect acute adaptations to a bout of eccentric exercise.
Author(s): Clifford T, Bell O, West DJ, Howatson G, Stevenson EJ
Publication type: Article
Publication status: Published
Journal: Journal of Sports Sciences
Online publication date: 07/06/2016
Acceptance date: 18/05/2016
Date deposited: 22/08/2018
ISSN (print): 0264-0414
ISSN (electronic): 1466-447X
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